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c906108c SS |
1 | /* Parameters for target machine ARC, for GDB, the GNU debugger. |
2 | Copyright (C) 1995 Free Software Foundation, Inc. | |
3 | Contributed by Cygnus Support. | |
4 | ||
5 | This file is part of GDB. | |
6 | ||
7 | This program is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 2 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | This program is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with this program; if not, write to the Free Software | |
19 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ | |
20 | ||
21 | /* Used by arc-tdep.c to set the default cpu type. */ | |
22 | #define DEFAULT_ARC_CPU_TYPE "base" | |
23 | ||
24 | /* Byte order is selectable. */ | |
25 | #define TARGET_BYTE_ORDER_SELECTABLE | |
26 | ||
27 | /* We have IEEE floating point, if we have any float at all. */ | |
28 | #define IEEE_FLOAT | |
29 | ||
30 | /* Offset from address of function to start of its code. | |
31 | Zero on most machines. */ | |
32 | #define FUNCTION_START_OFFSET 0 | |
33 | ||
34 | /* Advance PC across any function entry prologue instructions | |
35 | to reach some "real" code. SKIP_PROLOGUE_FRAMELESS_P advances | |
36 | the PC past some of the prologue, but stops as soon as it | |
37 | knows that the function has a frame. Its result is equal | |
38 | to its input PC if the function is frameless, unequal otherwise. */ | |
39 | ||
b83266a0 SS |
40 | #define SKIP_PROLOGUE(pc) (arc_skip_prologue (pc, 0)) |
41 | #define SKIP_PROLOGUE_FRAMELESS_P(pc) (arc_skip_prologue (pc, 1)) | |
42 | extern CORE_ADDR arc_skip_prologue PARAMS ((CORE_ADDR, int)); | |
c906108c SS |
43 | |
44 | /* Sequence of bytes for breakpoint instruction. | |
45 | ??? The current value is "sr -1,[-1]" and is for the simulator only. | |
46 | The simulator watches for this and does the right thing. | |
47 | The hardware version will have to associate with each breakpoint | |
48 | the sequence "flag 1; nop; nop; nop". IE: The breakpoint insn will not | |
49 | be a fixed set of bits but instead will be a branch to a semi-random | |
50 | address. Presumably this will be cleaned up for "second silicon". */ | |
51 | #define BIG_BREAKPOINT { 0x12, 0x1f, 0xff, 0xff } | |
52 | #define LITTLE_BREAKPOINT { 0xff, 0xff, 0x1f, 0x12 } | |
53 | ||
54 | /* Given the exposed pipeline, there isn't any one correct value. | |
55 | However, this value must be 4. GDB can't handle any other value (other than | |
56 | zero). See for example infrun.c: | |
57 | "prev_pc != stop_pc - DECR_PC_AFTER_BREAK" */ | |
58 | /* FIXME */ | |
59 | #define DECR_PC_AFTER_BREAK 8 | |
60 | ||
61 | /* We don't have a reliable single step facility. | |
62 | ??? We do have a cycle single step facility, but that won't work. */ | |
63 | #define SOFTWARE_SINGLE_STEP_P 1 | |
64 | extern void arc_software_single_step PARAMS ((unsigned int, int)); | |
65 | #define SOFTWARE_SINGLE_STEP(sig,bp_p) arc_software_single_step (sig, bp_p) | |
66 | ||
67 | /* FIXME: Need to set STEP_SKIPS_DELAY. */ | |
68 | ||
69 | /* Given a pc value as defined by the hardware, return the real address. | |
70 | Remember that on the ARC blink contains that status register which | |
71 | includes PC + flags (so we have to mask out the flags). */ | |
72 | #define ARC_PC_TO_REAL_ADDRESS(pc) (((pc) & 0xffffff) << 2) | |
73 | ||
74 | /* Immediately after a function call, return the saved pc. | |
75 | Can't always go through the frames for this because on some machines | |
76 | the new frame is not set up until the new function | |
77 | executes some instructions. */ | |
78 | ||
79 | #define SAVED_PC_AFTER_CALL(frame) \ | |
80 | (ARC_PC_TO_REAL_ADDRESS (read_register (BLINK_REGNUM))) | |
81 | ||
82 | /* Stack grows upward */ | |
83 | ||
84 | #define INNER_THAN(lhs,rhs) ((lhs) < (rhs)) | |
85 | ||
86 | /* Say how long (ordinary) registers are. This is a piece of bogosity | |
87 | used in push_word and a few other places; REGISTER_RAW_SIZE is the | |
88 | real way to know how big a register is. */ | |
89 | #define REGISTER_SIZE 4 | |
90 | ||
91 | /* Number of machine registers */ | |
92 | #define NUM_REGS 92 | |
93 | ||
94 | /* Initializer for an array of names of registers. | |
95 | There should be NUM_REGS strings in this initializer. */ | |
96 | ||
97 | #define REGISTER_NAMES \ | |
98 | { \ | |
99 | /* 0 */ "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", \ | |
100 | /* 8 */ "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15", \ | |
101 | /* 16 */ "r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23", \ | |
102 | /* 24 */ "r24", "r25", "r26", "fp", "sp", "ilink1", "ilink2", "blink", \ | |
103 | /* 32 */ "r32", "r33", "r34", "r35", "r36", "r37", "r38", "r39", \ | |
104 | /* 40 */ "r40", "r41", "r42", "r43", "r44", "r45", "r46", "r47", \ | |
105 | /* 48 */ "r48", "r49", "r50", "r51", "r52", "r53", "r54", "r55", \ | |
106 | /* 56 */ "r56", "mlo", "mmid", "mhi", "lp_count", \ | |
107 | /* 61 */ "status", "sema", "lp_start", "lp_end", "identity", "debug", \ | |
108 | /* 67 */ "aux10", "aux11", "aux12", "aux13", "aux14", \ | |
109 | /* 72 */ "aux15", "aux16", "aux17", "aux18", "aux19", \ | |
110 | /* 77 */ "aux1a", "aux1b", "aux1c", "aux1d", "aux1e", \ | |
111 | /* 82 */ "aux1f", "aux20", "aux21", "aux22", \ | |
112 | /* 86 */ "aux30", "aux31", "aux32", "aux33", "aux40", \ | |
113 | /* 91 */ "pc" \ | |
114 | } | |
115 | ||
116 | /* Register numbers of various important registers (used to index | |
117 | into arrays of register names and register values). */ | |
118 | ||
119 | #define R0_REGNUM 0 /* First local register */ | |
120 | #define R59_REGNUM 59 /* Last local register */ | |
121 | #define FP_REGNUM 27 /* Contains address of executing stack frame */ | |
122 | #define SP_REGNUM 28 /* stack pointer */ | |
123 | #define BLINK_REGNUM 31 /* link register */ | |
124 | #define STA_REGNUM 61 /* processor status word */ | |
125 | #define PC_REGNUM 91 /* instruction pointer */ | |
126 | #define AUX_BEG_REGNUM 61 /* aux reg begins */ | |
127 | #define AUX_END_REGNUM 90 /* aux reg ends, pc not real aux reg */ | |
128 | ||
129 | /* Fake registers used to mark immediate data. */ | |
130 | #define SHIMM_FLAG_REGNUM 61 | |
131 | #define LIMM_REGNUM 62 | |
132 | #define SHIMM_REGNUM 63 | |
133 | ||
134 | #define AUX_REG_MAP \ | |
135 | { \ | |
136 | { 0, 1, 2, 3, 4, 5, \ | |
137 | 16, -1, -1, -1, -1, \ | |
138 | -1, -1, -1, -1, -1, \ | |
139 | -1, -1, -1, -1, 30, \ | |
140 | -1, 32, 33, -1, \ | |
141 | 48, 49, 50, 51, 64, \ | |
142 | 0 \ | |
143 | }, \ | |
144 | { 0, 1, 2, 3, 4, 5, \ | |
145 | 16, -1, -1, -1, -1, \ | |
146 | -1, -1, -1, -1, -1, \ | |
147 | -1, -1, -1, -1, 30, \ | |
148 | 31, 32, 33, -1, \ | |
149 | -1, -1, -1, -1, -1, \ | |
150 | 0 \ | |
151 | }, \ | |
152 | { 0, 1, 2, 3, 4, 5, \ | |
153 | 16, 17, 18, 19, 20, \ | |
154 | 21, 22, 23, 24, 25, \ | |
155 | 26, 27, 28, 29, 30, \ | |
156 | 31, 32, 33, 34, \ | |
157 | -1, -1, -1, -1, -1, \ | |
158 | 0 \ | |
159 | } \ | |
160 | } | |
161 | ||
162 | #define PFP_REGNUM R0_REGNUM /* Previous frame pointer */ | |
163 | ||
164 | /* Total amount of space needed to store our copies of the machine's | |
165 | register state, the array `registers'. */ | |
166 | #define REGISTER_BYTES (NUM_REGS * 4) | |
167 | ||
168 | /* Index within `registers' of the first byte of the space for register N. */ | |
169 | #define REGISTER_BYTE(N) (4*(N)) | |
170 | ||
171 | /* Number of bytes of storage in the actual machine representation | |
172 | for register N. */ | |
173 | #define REGISTER_RAW_SIZE(N) 4 | |
174 | ||
175 | /* Number of bytes of storage in the program's representation for register N. */ | |
176 | #define REGISTER_VIRTUAL_SIZE(N) 4 | |
177 | ||
178 | /* Largest value REGISTER_RAW_SIZE can have. */ | |
179 | #define MAX_REGISTER_RAW_SIZE 4 | |
180 | ||
181 | /* Largest value REGISTER_VIRTUAL_SIZE can have. */ | |
182 | #define MAX_REGISTER_VIRTUAL_SIZE 4 | |
183 | ||
184 | /* Return the GDB type object for the "standard" data type | |
185 | of data in register N. */ | |
186 | #define REGISTER_VIRTUAL_TYPE(N) (builtin_type_int) | |
187 | ||
188 | \f | |
189 | /* Macros for understanding function return values... */ | |
190 | ||
191 | /* Does the specified function use the "struct returning" convention | |
192 | or the "value returning" convention? The "value returning" convention | |
193 | almost invariably returns the entire value in registers. The | |
194 | "struct returning" convention often returns the entire value in | |
195 | memory, and passes a pointer (out of or into the function) saying | |
196 | where the value (is or should go). | |
197 | ||
198 | Since this sometimes depends on whether it was compiled with GCC, | |
199 | this is also an argument. This is used in call_function to build a | |
200 | stack, and in value_being_returned to print return values. | |
201 | ||
202 | On arc, a structure is always retunred with pointer in r0. */ | |
203 | ||
204 | #define USE_STRUCT_CONVENTION(gcc_p, type) 1 | |
205 | ||
206 | /* Extract from an array REGBUF containing the (raw) register state | |
207 | a function return value of type TYPE, and copy that, in virtual format, | |
208 | into VALBUF. This is only called if USE_STRUCT_CONVENTION for this | |
209 | type is 0. | |
210 | */ | |
211 | #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \ | |
212 | memcpy(VALBUF, REGBUF+REGISTER_BYTE(R0_REGNUM), TYPE_LENGTH (TYPE)) | |
213 | ||
214 | /* If USE_STRUCT_CONVENTION produces a 1, | |
215 | extract from an array REGBUF containing the (raw) register state | |
216 | the address in which a function should return its structure value, | |
217 | as a CORE_ADDR (or an expression that can be used as one). */ | |
218 | #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) \ | |
219 | (error("Don't know where large structure is returned on arc"), 0) | |
220 | ||
221 | /* Write into appropriate registers a function return value | |
222 | of type TYPE, given in virtual format, for "value returning" functions. | |
223 | For 'return' command: not (yet) implemented for arc. */ | |
224 | #define STORE_RETURN_VALUE(TYPE,VALBUF) \ | |
225 | error ("Returning values from functions is not implemented in arc gdb") | |
226 | ||
227 | /* Store the address of the place in which to copy the structure the | |
228 | subroutine will return. This is called from call_function. */ | |
229 | #define STORE_STRUCT_RETURN(ADDR, SP) \ | |
230 | error ("Returning values from functions is not implemented in arc gdb") | |
231 | ||
232 | \f | |
233 | /* Describe the pointer in each stack frame to the previous stack frame | |
234 | (its caller). */ | |
235 | ||
236 | /* We cache information about saved registers in the frame structure, | |
237 | to save us from having to re-scan function prologues every time | |
238 | a register in a non-current frame is accessed. */ | |
239 | ||
240 | #define EXTRA_FRAME_INFO \ | |
241 | struct frame_saved_regs *fsr; \ | |
242 | CORE_ADDR arg_pointer; | |
243 | ||
244 | /* Zero the frame_saved_regs pointer when the frame is initialized, | |
245 | so that FRAME_FIND_SAVED_REGS () will know to allocate and | |
246 | initialize a frame_saved_regs struct the first time it is called. | |
247 | Set the arg_pointer to -1, which is not valid; 0 and other values | |
248 | indicate real, cached values. */ | |
249 | ||
250 | #define INIT_EXTRA_FRAME_INFO(fromleaf, fi) \ | |
251 | ((fi)->fsr = 0, (fi)->arg_pointer = -1) | |
252 | ||
253 | /* FRAME_CHAIN takes a frame's nominal address | |
254 | and produces the frame's chain-pointer. | |
255 | However, if FRAME_CHAIN_VALID returns zero, | |
256 | it means the given frame is the outermost one and has no caller. */ | |
257 | /* On the arc, we get the chain pointer by reading the PFP saved | |
258 | on the stack. */ | |
259 | /* The PFP and RPC is in fp and fp+4. */ | |
260 | ||
261 | #define FRAME_CHAIN(thisframe) \ | |
262 | (read_memory_integer (FRAME_FP (thisframe), 4)) | |
263 | ||
264 | /* FRAME_CHAIN_VALID returns zero if the given frame is the outermost one | |
265 | and has no caller. */ | |
266 | #define FRAME_CHAIN_VALID(chain, thisframe) nonnull_frame_chain_valid (chain, thisframe) | |
267 | ||
392a587b JM |
268 | /* An expression that tells us whether the function invocation represented |
269 | by FI does not have a frame on the stack associated with it. */ | |
270 | ||
271 | #define FRAMELESS_FUNCTION_INVOCATION(FI) \ | |
272 | (((FI)->signal_handler_caller) ? 0 : frameless_look_for_prologue (FI)) | |
c906108c SS |
273 | |
274 | /* Where is the PC for a specific frame. | |
275 | A leaf function may never save blink, so we have to check for that here. */ | |
276 | ||
277 | #define FRAME_SAVED_PC(frame) (arc_frame_saved_pc (frame)) | |
278 | struct frame_info; /* in case frame.h not included yet */ | |
279 | CORE_ADDR arc_frame_saved_pc PARAMS ((struct frame_info *)); | |
280 | ||
281 | /* If the argument is on the stack, it will be here. | |
282 | We cache this value in the frame info if we've already looked it up. */ | |
283 | /* ??? Is the arg_pointer check necessary? */ | |
284 | ||
285 | #define FRAME_ARGS_ADDRESS(fi) \ | |
286 | (((fi)->arg_pointer != -1) ? (fi)->arg_pointer : (fi)->frame) | |
287 | ||
288 | /* This is the same except it should return 0 when | |
289 | it does not really know where the args are, rather than guessing. | |
290 | This value is not cached since it is only used infrequently. */ | |
291 | ||
292 | #define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame) | |
293 | ||
294 | /* Set NUMARGS to the number of args passed to a frame. | |
295 | Can return -1, meaning no way to tell. */ | |
296 | ||
392a587b | 297 | #define FRAME_NUM_ARGS(fi) (-1) |
c906108c SS |
298 | |
299 | /* Return number of bytes at start of arglist that are not really args. */ | |
300 | ||
301 | #define FRAME_ARGS_SKIP 0 | |
302 | ||
303 | /* Produce the positions of the saved registers in a stack frame. */ | |
304 | ||
305 | #define FRAME_FIND_SAVED_REGS(frame_info_addr, sr) \ | |
306 | frame_find_saved_regs (frame_info_addr, &sr) | |
307 | extern void frame_find_saved_regs(); /* See arc-tdep.c */ | |
308 | ||
309 | \f | |
310 | /* Things needed for making calls to functions in the inferior process */ | |
311 | #define PUSH_DUMMY_FRAME \ | |
312 | push_dummy_frame () | |
313 | ||
314 | /* Discard from the stack the innermost frame, restoring all registers. */ | |
315 | #define POP_FRAME \ | |
316 | pop_frame () | |
317 | ||
318 | /* This sequence of words is the instructions bl xxxx, flag 1 */ | |
319 | #define CALL_DUMMY { 0x28000000, 0x1fbe8001 } | |
320 | #define CALL_DUMMY_LENGTH 8 | |
321 | ||
322 | /* Start execution at beginning of dummy */ | |
323 | #define CALL_DUMMY_START_OFFSET 0 | |
324 | ||
325 | /* Insert the specified number of args and function address | |
326 | into a call sequence of the above form stored at 'dummyname'.*/ | |
327 | #define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p) \ | |
328 | { \ | |
329 | int from, to, delta, loc; \ | |
330 | loc = (int)(read_register (SP_REGNUM) - CALL_DUMMY_LENGTH); \ | |
331 | from = loc + 4; \ | |
332 | to = (int)(fun); \ | |
333 | delta = (to - from) >> 2; \ | |
334 | *((char *)(dummyname) + 1) = (delta & 0x1); \ | |
335 | *((char *)(dummyname) + 2) = ((delta >> 1) & 0xff); \ | |
336 | *((char *)(dummyname) + 3) = ((delta >> 9) & 0xff); \ | |
337 | *((char *)(dummyname) + 4) = ((delta >> 17) & 0x7); \ | |
338 | } | |
339 |